Tom Bruhns wrote:
"What`s the reactance at the anti-resonance point? Is highest SWR at
anti-resonance or at maximum reactance or at some point between?"

I don`t quite understand the questions but that`s no inhibition.

The anti-resonance point must be at the drivepoint of an end-fed
1/2-wave element because anti-resonance is the frequency at which the
impedance of the system is very high.

If the system is anti-resonant, reactance is zero.

Highest SWR comes from greatest mismatch. It gets no worse that from an
open or short circuit. The original question concerned 1/4-wave and
1/2-wave resonances.

SWR is highest at the reflection point because it is a creature of the
reflected wave`s reaction with the incident wave, and nowhere can the
reflected wave be stronger than at the tip of the antenna.

The open circuit at the tip has some capacitance, but the only effect of
this reactance is to shift the standing wave pattern along the antenna
according to transmission line analogy. Unlike a transmission line, the
impedance seen by a wave traveling in either direction along an antenna
varies from one end to the other.

As usual, I hope to learn something from this thread.

Best regards, Richard Harrison, KB5WZI